I do not consider this as a bug, 'ping' is not able to work also.
➜ ~ hostnamectl
Static hostname: 1610
Icon name: computer-vm
Chassis: vm
Machine ID: da29c08f2e840385b1d700a257211f57
Boot ID: f0dad3c50b2d42bb998955dee24cdef8
Virtualization: kvm
Operating System: Ubuntu 16.10
Kernel: Linux 4.8.0-040800rc6-generic
Architecture: ppc64-le
➜ ~ hostnamectl
➜ ~ ping 1610
connect: Invalid argument
➜ ~ cat /etc/hosts | grep 1610
127.0.1.1 1610
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https://bugs.launchpad.net/bugs/1529033
Title:
Install/start fails when hostname is numeric
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